I think this combo would be fine in a 100 gal. I would strongly recomend you adding this Anthias early on because in my experience they take a bit to get acclimated and can be finiky eaters. As anthias are schooling fish and I you have a good size tank I would bump your number of swallow-tails abit to keep a nice healthy school. LORD knows a strong male can't have enough females in his harem. Glad to see an Anthias on your stocking list
ALSO I have to side with Rob on this one the Bluethorat and the Niger (IMO + IME) are the most soicable and peaceful Triggers. Though I feel this debate can go on forever I think we will all agree on Triggers are wonderful addition to FOWLER tanks. A side note I have had my bluethroat and my niger in my reef tanks for several years before I moved across country and 1 they were ideal citizens and 2 they both had wonderful personalities.